Pain is one thing because it's immediate. Suffering, however, is the past intruding on present circumstances. Suffering is one way that people keep in place the image of who they THINK they are. See through the illusion of what you think yourself to be and suffering dissolves. However, the prospect of dropping one's personal identity for the truth of one's being is a scary proposition, so most will hang on to what is familiar even if it involves suffering. So there IS a sort of love relationshiip with it because it helps provide an identity.
Well-said, Poppers. For those of us raised as Jehovah's Witnesses, the inculcation during our formative years of a world view dominated by cult dogma is a deeply embedded part of our personalities. The longer we are out, the more we are able to integrate that view with a more informed world-view - but the former will always be there - entwined, but less dominant.